mineral
Agate (specifically Lace Agate or Banded Agate)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 (Mohs scale); Color: Multicolored bands including brown, white, gray, and red; Luster: Waxy to vitreous; Crystal structure: Hexagonal/trigonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64.
- Hardness
- 6
- Color
- Multicolored bands including brown, white, gray, and red
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Multicolored bands including brown, white, gray, and red; Luster: Waxy to vitreous; Crystal structure: Hexagonal/trigonal (cryptocrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58–2.64.
Formation & geological history
Formed as secondary deposits in volcanic cavities (amygdales) or sedimentary rocks. Silica-rich fluids precipitate in layers over long periods, often associated with ancient volcanic activity ranging from millions to billions of years old.
Uses & applications
Primarily used in jewelry for cabochons and beads, as well as ornamental carvings, paperweights, and collection specimens. Historically used for making precision bearings and pestles.
Geological facts
Agate is named after the Achates River in Sicily where it was first discovered. The 'lace' or 'eye' patterns seen here are caused by rhythmic crystallization of quartz and moganite in confined spaces.
Field identification & locations
Identify in the field by its distinct colorful banding, waxy texture when broken, and lack of cleavage (concave, shell-like fractures). Commonly found in areas with eroded volcanic basalt, such as the Lake Superior region, Mexico (Laguna/Crazy Lace), and Brazil. Collectors should look for 'nodules' that feel heavier than typical rocks.
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Septarian Pebble
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